1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
package renderer
import "core:log"
import bk "../backend"
import ir "../render_ir"
import "../profile"
import "../resource"
Renderer_State :: struct {
frame_active: bool,
in_3d_mode: bool,
batch_2d: Batch_2D,
draw_queue_3d: Draw_Queue_3D,
depth_buffer: Depth_Buffer,
pipeline_3d: [bk.MAX_LAYOUT_VARIANTS]bk.Pipeline_Handle,
pipeline_3d_double_sided: [bk.MAX_LAYOUT_VARIANTS]bk.Pipeline_Handle,
builtin_cube: u32,
builtin_sphere: u32,
builtin_plane: u32,
grid_mesh: u32,
grid_slices: i32,
grid_spacing: f32,
grid_valid: bool,
// Lighting
light_state: Light_State,
pipeline_3d_lit: [bk.MAX_LAYOUT_VARIANTS]bk.Pipeline_Handle,
pipeline_3d_lit_double_sided: [bk.MAX_LAYOUT_VARIANTS]bk.Pipeline_Handle,
pipeline_2d_lit: bk.Pipeline_Handle,
lighting_enabled_3d: bool,
lighting_enabled_2d: bool,
shadows_enabled: bool,
camera_pos_3d: [3]f32,
camera_target_3d: [3]f32,
// Shadows
shadow_state: Shadow_State,
pipeline_3d_lit_shadowed: [bk.MAX_LAYOUT_VARIANTS]bk.Pipeline_Handle,
pipeline_3d_lit_shadowed_double_sided: [bk.MAX_LAYOUT_VARIANTS]bk.Pipeline_Handle,
// Generic 3D billboards
billboard_3d_batch: Billboard_3D_Batch,
camera_right: [3]f32,
camera_up: [3]f32,
// Deferred render pass state
render_pass_begun: bool,
deferred_clear_color: [4]f32,
// Per-frame render IR scratch used by incrementally migrated frontend paths.
frame_ir: ir.Frame_IR,
profile: profile.Counters,
// Backend reference + frame context
backend: ^bk.Backend,
frame_ctx: bk.Frame_Context,
}
init_renderer :: proc(b: ^bk.Backend, res_state: ^resource.Resource_State) -> (state: Renderer_State, ok: bool) {
state.backend = b
extent := b.get_extent()
// Create depth buffer
db, db_ok := create_depth_buffer(b, extent.width, extent.height)
if !db_ok {
return {}, false
}
state.depth_buffer = db
// Create 2D batch
batch, batch_ok := init_batch_2d(b, res_state)
if !batch_ok {
destroy_depth_buffer(b, &state.depth_buffer)
return {}, false
}
state.batch_2d = batch
// Initialize 3D draw queue
state.draw_queue_3d.resource_state = res_state
// Create builtin meshes (PNU layout — 32 bytes/vertex, no vertex color)
cube_verts, cube_idxs := resource.gen_cube_geometry(1, 1, 1)
defer delete(cube_verts)
defer delete(cube_idxs)
cube_id, _, cube_ok := resource.upload_mesh_raw(
res_state, b,
raw_data(cube_verts), len(cube_verts) * size_of(resource.Mesh_Vertex_PNU),
i32(len(cube_verts)), cube_idxs, bk.LAYOUT_POS_NORM_UV,
)
if cube_ok {
state.builtin_cube = cube_id
} else {
log.warn("gpu/renderer: failed to create builtin cube mesh")
}
sphere_verts, sphere_idxs := resource.gen_sphere_geometry(1, 16, 32)
defer delete(sphere_verts)
defer delete(sphere_idxs)
sphere_id, _, sphere_ok := resource.upload_mesh_raw(
res_state, b,
raw_data(sphere_verts), len(sphere_verts) * size_of(resource.Mesh_Vertex_PNU),
i32(len(sphere_verts)), sphere_idxs, bk.LAYOUT_POS_NORM_UV,
)
if sphere_ok {
state.builtin_sphere = sphere_id
} else {
log.warn("gpu/renderer: failed to create builtin sphere mesh")
}
plane_verts, plane_idxs := resource.gen_plane_geometry(1, 1, 1, 1)
defer delete(plane_verts)
defer delete(plane_idxs)
plane_id, _, plane_ok := resource.upload_mesh_raw(
res_state, b,
raw_data(plane_verts), len(plane_verts) * size_of(resource.Mesh_Vertex_PNU),
i32(len(plane_verts)), plane_idxs, bk.LAYOUT_POS_NORM_UV,
)
if plane_ok {
state.builtin_plane = plane_id
} else {
log.warn("gpu/renderer: failed to create builtin plane mesh")
}
if !init_billboard_3d_batch(&state.billboard_3d_batch, b) {
log.warn("gpu/renderer: failed to create 3D billboard batch buffers")
}
// Initialize lighting system
if !init_light_state(&state.light_state, b) {
log.warn("gpu/renderer: failed to initialize lighting state")
}
state.frame_ir = ir.init_frame_ir()
return state, true
}
shutdown_renderer :: proc(state: ^Renderer_State, b: ^bk.Backend) {
ir.destroy_frame_ir(&state.frame_ir)
shutdown_billboard_3d_batch(&state.billboard_3d_batch, b)
for v in 0..<bk.MAX_LAYOUT_VARIANTS {
b.destroy_graphics_pipeline(state.pipeline_3d_lit_shadowed[v])
b.destroy_graphics_pipeline(state.pipeline_3d_lit_shadowed_double_sided[v])
}
shutdown_shadow_state(&state.shadow_state, b)
for v in 0..<bk.MAX_LAYOUT_VARIANTS {
b.destroy_graphics_pipeline(state.pipeline_3d_lit[v])
b.destroy_graphics_pipeline(state.pipeline_3d_lit_double_sided[v])
}
b.destroy_graphics_pipeline(state.pipeline_2d_lit)
shutdown_light_state(&state.light_state, b)
if state.grid_valid {
resource.unload_mesh(state.draw_queue_3d.resource_state, b, state.grid_mesh)
state.grid_valid = false
}
for v in 0..<bk.MAX_LAYOUT_VARIANTS {
b.destroy_graphics_pipeline(state.pipeline_3d[v])
b.destroy_graphics_pipeline(state.pipeline_3d_double_sided[v])
}
shutdown_batch_2d(&state.batch_2d, b)
destroy_depth_buffer(b, &state.depth_buffer)
state.frame_active = false
}
on_swapchain_recreated :: proc(state: ^Renderer_State) {
extent := state.backend.get_extent()
// Recreate depth buffer at new dimensions
recreate_depth_buffer(state.backend, &state.depth_buffer, extent.width, extent.height)
update_screen_projection(&state.batch_2d, f32(extent.width), f32(extent.height))
// Recreate depth prepass at new screen size
on_shadow_resize(&state.shadow_state, state.backend, extent.width, extent.height)
}
// Begin a new frame.
// Render pass is deferred until first draw operation (allows compute before render pass).
begin_frame :: proc(state: ^Renderer_State, clear_color: [4]f32) {
prof_start := profile.now()
ctx, ok := state.backend.begin_frame(clear_color)
if !ok {
return
}
state.profile.frame_begin_ns += profile.elapsed_ns(prof_start, profile.now())
state.profile.frame_count += 1
state.frame_ctx = ctx
state.deferred_clear_color = clear_color
state.render_pass_begun = false
reset_batch_2d(&state.batch_2d)
reset_draw_queue_3d(&state.draw_queue_3d)
reset_billboard_3d_batch(&state.billboard_3d_batch)
begin_batch_frame(&state.batch_2d, state.backend, ctx)
state.batch_2d.parent_state = state
state.billboard_3d_batch.parent_state = state
state.frame_active = true
state.in_3d_mode = false
}
// Lazily start the render pass. Called before any draw operation.
ensure_render_pass :: proc(state: ^Renderer_State) {
if state.render_pass_begun || !state.frame_active {
return
}
prof_start := profile.now()
state.backend.begin_default_pass(state.frame_ctx, state.deferred_clear_color)
extent := state.backend.get_extent()
state.backend.set_viewport(state.frame_ctx, 0, 0, f32(extent.width), f32(extent.height))
state.backend.set_scissor(state.frame_ctx, 0, 0, extent.width, extent.height)
state.profile.render_pass_begin_ns += profile.elapsed_ns(prof_start, profile.now())
state.render_pass_begun = true
}
// End frame: end render pass, submit command buffer, present.
// Returns true if swapchain was recreated.
end_frame :: proc(state: ^Renderer_State) -> bool {
if !state.frame_active {
return false
}
prof_start := profile.now()
// Flush 2D batch before ending render pass
flush_batch_2d(&state.batch_2d)
// Ensure render pass was started (even if no draws happened)
ensure_render_pass(state)
// End render pass
state.backend.end_render_pass(state.frame_ctx)
// End frame and present
resized := state.backend.end_frame(state.frame_ctx)
state.profile.frame_end_ns += profile.elapsed_ns(prof_start, profile.now())
state.frame_active = false
if resized {
on_swapchain_recreated(state)
return true
}
return false
}